On Wed, 24 May 2017 14:24:11 +0200
Michal Hocko <mhocko@xxxxxxxxxx> wrote:
[...]
> index facc20a3f962..ec7d6ae01c96 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -2246,8 +2246,11 @@
[...]
> + movable. This means that the memory of such nodes
> + will be usable only for movable allocations which
> + rules out almost all kernel allocations. Use with
> + caution!
maybe dumb question but, is it really true that kernel won't ever
do kernel allocations from movable zone?
looking at kmalloc(slab): we can get here:
get_page_from_freelist() ->
rmqueue() ->
__rmqueue() ->
__rmqueue_fallback() ->
find_suitable_fallback()
and it might return movable fallback and page could be stolen from there.
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